CN216203469U - Direct heat exchange type gasification fine slag resource utilization system - Google Patents
Direct heat exchange type gasification fine slag resource utilization system Download PDFInfo
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- CN216203469U CN216203469U CN202122558887.4U CN202122558887U CN216203469U CN 216203469 U CN216203469 U CN 216203469U CN 202122558887 U CN202122558887 U CN 202122558887U CN 216203469 U CN216203469 U CN 216203469U
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Abstract
The utility model relates to the field of coal chemical industry, in particular to a direct heat exchange type gasification fine slag resource utilization system. The system comprises: the device comprises a fine slag conveying system, a fine slag drying system, a dry slag storage and washing unit, a fine slag combustion system, an air preheating system and a flue gas treatment system. The system can realize the combustion of the fine slag with low heat value under the condition of no auxiliary combustion of an external heat source, one part of generated heat is used for drying the fine slag, the redundant heat can be used for utilizing waste heat (such as steam generation), the fly ash with volcanic ash-like property is obtained after the fine slag is combusted and decarburized, and the fly ash is an excellent building material raw material. The system realizes the decarbonization and resource utilization of the gasified fine slag, can treat solid waste fine slag, and plays a positive role in carbon emission reduction and carbon neutralization.
Description
Technical Field
The utility model relates to the field of coal chemical industry, in particular to a direct heat exchange type gasification fine slag resource utilization system.
Background
The gasification fine slag refers to ash slag collected by a slag washing pool after coal reacts in a coal water slurry furnace or an entrained flow bed gasification furnace in the coal chemical production process, and belongs to industrial waste. With the rapid development of the coal chemical industry in China, the output of gasified fine slag is increased year by year, and the discharge amount of the gasified fine slag is about 6000 million tons to 1 hundred million tons every year. The content of dry-based combustible materials of the gasification fine slag is 18-65%, while the carbon content of the gasification fine slag after drying and dehydration is mostly between 15-40%, and the residual heat value is about 1200-3500 kcal/kg. Therefore, the way of handling the gasified fine slag is of great importance. At present, gasification fine slag is treated mainly in a full filling treatment mode, waste of land resources, water resources and residual heat energy is caused, and environmental pollution is caused. The problem of how to treat the gasified fine slag to improve the energy utilization rate, reduce the environmental pollution and the like is an urgent task currently faced by the coal chemical industry.
Through retrieval, the utility model patent application with the patent name of 'treatment system and method for gasified fine slag' has the application number of CN 113028418A and the published date of 2021, 6 and 25, and discloses a treatment system and a method for mixed-burning gasified fine slag of a circulating fluidized bed boiler in the technical field of coal chemical industry, and the main equipment is as follows: a feeding and drying device and a circulating fluidized bed boiler device. The system utilizes equipment such as a slurry pump, a belt conveyor, a circulating fluidized bed boiler and the like to squeeze and dewater the gasified fine slag, heats the squeezed gasified fine slag through a low-grade heat source until water boils to obtain a gasified fine slag filter cake, and then crushes the gasified fine slag filter cake. The utility model solves the problems of high difficulty in solid waste treatment and serious environmental pollution of the gasified fine slag by carrying out drying and mixed combustion treatment on the gasified fine slag, but has more complicated treatment process and more equipment devices, and adopts the procedures of dehydrating and mixed combustion treatment on the gasified fine slag by means of external energy, namely a low-grade heat source, dehydrating and drying the gasified fine slag to obtain a gasified fine slag filter cake, crushing and the like, thereby causing energy consumption in another form.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved by patent
The utility model provides a system for recycling gasified fine slag, which can realize the combustion of the fine slag with low heat value under the condition of no external heat source co-combustion in the normal operation stage, introduces an air preheating system to collect and recycle the heat generated by drying (adopting a direct heat exchange mode), combustion and vaporization, and can recycle the fly ash with the volcanic ash-like property obtained after the fine slag is combusted and decarburized as an excellent building material raw material. The method is more energy-saving, environment-friendly, synergistic and simplified in treating the gasified fine slag, and solves the industry bottleneck problems of high difficulty in treating the gasified fine slag, serious environmental pollution and energy waste.
2. Technical scheme
The purpose of the utility model is realized by the following technical scheme:
a direct heat exchange type gasification fine slag resource utilization system comprises a fine slag conveying system, a fine slag drying system, a dry slag storage unit, a fine slag combustion system, an air preheating system and a flue gas treatment system; the fine slag conveying system is arranged at the foremost end of the system, and the output end of the fine slag conveying system is connected with one input end of the fine slag drying system; the fine slag drying system, the dry slag storage unit, the fine slag combustion system and the air preheating system are sequentially connected; the output end of the air preheating system is connected with the other input end of the fine slag drying system; the flue gas treatment system is arranged at the tail end of the system, and the output end of the air preheating system is connected with the input end of the flue gas treatment system.
A wet fine slag conveying channel is arranged between the fine slag conveying system and the fine slag drying system, and a conveying channel for a mixture of dry fine slag and air is arranged between the fine slag drying system and the dry slag storage unit. The dry slag storage unit comprises a quantitative feeding device, and the quantitative feeding device mixes the dry fine slag and hot air conveyed by the air preheating system and conveys the mixed dry fine slag and hot air to the fine slag combustion system together as primary air of the fine slag combustion system. And a conveying channel for hot air and hot fine slag is arranged between the fine slag combustion system and the dry slag storage unit, and the fine slag combustion system combusts the mixed hot air and hot fine slag conveyed by the dry slag storage unit to obtain ash-containing flue gas and steam.
The fine slag combustion system is provided with a combustion furnace, an adiabatic combustion section and a steam generation section are arranged in the combustion furnace, and the adiabatic combustion section rapidly decarbonizes and combusts a mixture of dry fine slag and hot air; the steam generation section reacts the mixture of the hot fine slag and the hot air with water to obtain product steam, and simultaneously controls the temperature of ash-containing flue gas at the outlet of the fine slag combustion system.
An ash-containing flue gas conveying channel is arranged between the air preheating system and the fine slag combustion system, the air preheating system preheats and mixes the ash-containing flue gas conveyed by the fine slag combustion system and the air, and hot air and the ash-containing flue gas are obtained after direct heat exchange. A hot air conveying channel is arranged between the air preheating system and the fine slag combustion system; a hot air conveying channel is arranged between the air preheating system and the dry slag storage unit; an ash-containing flue gas conveying channel is arranged between the air preheating system and the flue gas treatment system.
The flue gas treatment system is provided with a discharge end and is used for discharging the ash-containing flue gas conveyed by the air preheating system after dedusting.
Furthermore, a dust remover is arranged in the flue gas treatment system and used for carrying out solid-gas separation on the dust-containing flue gas output by the air preheating system.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:
the system can realize independent combustion of gasified fine slag without the consumption of external energy, the heat generated by the system is utilized to support the drying raw material, and meanwhile, the surplus heat can be used as surplus heat (such as steam generation). The system can preheat air by a preheating system in a direct heat exchange mode through smoke-containing gas, and dry fine slag in the fine slag storage unit is preheated by part of preheated air and then is input into a fine slag combustion system; part of preheated air enters the fine slag combustion system to participate in combustion and enters the fine slag drying system in the form of ash-containing flue gas, so that the multiple recycling of energy is realized.
In addition, the ash-containing flue gas treated by the system can be separated by solid and gas, and the solid part can be collected by a dust remover as fly ash and can be used as an excellent building material raw material; the flue gas after dust removal is discharged to the atmosphere, and the environmental pollution caused by the emission of waste gas slag is reduced.
To sum up, this system utilizes self device design advantage, has realized that the thin sediment of gasification independently burns and utilizes the thin sediment of humidifying dry, the waste heat energy source recycling that the burning produced, adopts measures such as direct heat transfer, preheated air circulation, self system waste heat circulation, more energy-conserving, environmental protection, the thin sediment of processing gasification with increasing efficiency, reaches the dry decarbonization utilization's of thin sediment purpose, has solved the thin sediment of gasification and has handled the big degree of difficulty, environmental pollution is serious, the extravagant industry bottleneck problem of energy.
Drawings
FIG. 1 is a schematic view of a system for resource utilization of gasified fine slag provided by the utility model;
the reference numerals in the schematic drawings illustrate: 1. a fine slag delivery system; 2. a fine slag drying system; 3. a dry slag storage unit; 4. a fine slag combustion system; 5. an air preheating system; 6. flue gas processing system.
Detailed Description
For a further understanding of the utility model, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of the present patent.
Fig. 1 is a flow chart of a system for resource utilization of gasified fine slag provided by the embodiment of the present invention, and the flow chart includes 6 subsystem units: the system comprises a fine slag conveying system 1, a fine slag drying system 2, a dry slag storage unit 3, a fine slag combustion system 4, an air preheating system 5 and a flue gas treatment system 6.
As shown in fig. 1, the fine slag conveying system 1 is arranged at the foremost end of the system, and the output end of the fine slag conveying system 1 is connected with one input end of the fine slag drying system 2; the fine slag drying system 2, the dry slag storage unit 3, the fine slag combustion system 4 and the air preheating system 5 are sequentially connected to form a closed circulating structure. The output end of the air preheating system 5 is connected with the other input end of the fine slag drying system 2; the flue gas treatment system 6 is arranged at the tail end of the system, and the output end of the fine slag drying system 2 is connected with the input end of the flue gas treatment system 6.
The wet refined slag with the water content of 20-50% is conveyed to a refined slag drying system 2 through various levels of refined slag conveying equipment in a refined slag conveying system 1, and the wet refined slag is dried from the water content of 20-50% to the water content of 1-7% in the refined slag conveying system 1 in a heat exchange mode with ash-containing hot flue gas.
As shown in FIG. 1, the main equipment of the fine slag combustion system 4 is a combustion furnace. The dry gasified fine slag dried in the fine slag conveying system 1 is conveyed to a dry slag storage unit 3 by dry slag conveying equipment, the dry slag storage unit 3 comprises 4-8 sets of quantitative feeding devices, the dry fine slag is mixed with hot air 1 preheated by an air preheating system 5 through the 4-8 sets of quantitative feeding devices, the mixture of the dry fine slag and the hot air 1 is used as primary air of a fine slag combustion system 4 and enters the fine slag combustion system 4 together, the temperature of the mixture of the hot air and the hot fine slag before entering the fine slag combustion system 4 is about 200-750 ℃, the mixture of the hot air and the hot fine slag enters a combustion furnace in the fine slag combustion system 4 to be rapidly combusted, and heat is released.
As shown in fig. 1, the furnace is provided with an adiabatic combustion section and a steam generation section. In the adiabatic combustion section, dry fine slag and hot air are mixed to rapidly decarbonize and combust; and in the steam generation section, the high-temperature flue gas reacts with water to generate product steam, and the temperature of the ash-containing flue gas at the output end of the fine slag combustion system 4 is controlled. The temperature of the flue gas is generally controlled between 750 ℃ and 1050 ℃. The dry fine slag is decarbonized and combusted to form fly ash which is mixed with hot smoke, leaves the fine slag combustion system 4 in the form of ash-containing smoke and enters the air preheating system 5.
As shown in fig. 1, after ash-containing flue gas with a temperature of 750-1050 ℃ enters an air preheating system 5, air 1 and air N are preheated, wherein the air 1 is preheated to be "hot air 1", the air is mixed with dry fine slag output by a dry slag output unit 3 after being output by the air preheating system, and meanwhile, the dry fine slag output by the dry slag storage unit 3 is preheated to form a mixture of the hot air and the hot fine slag. The mixture is delivered to a combustion furnace in the fine slag combustion system 4 in the form of primary air at the input end of the fine slag combustion system 4 for combustion reaction.
As shown in figure 1, in the air preheating system 5, air N at the input end enters the air preheating system and is preheated into N paths of hot air N, and the hot air N is directly conveyed from the output end of the air preheating system to a combustion furnace of the fine slag combustion system 4 to participate in combustion reaction, so that the atmosphere favorable for combustion consumption is improved. The ash-containing smoke output by the fine slag combustion system preheats the N +1 paths of air in a direct heat exchange mode. Meanwhile, the ash-containing flue gas at 750-1050 ℃ is subjected to preheating treatment on air by an air preheating system, and is cooled to a certain degree. The temperature of the cooled ash-containing flue gas is about 250-700 ℃, and the cooled ash-containing flue gas is output to the fine slag drying system 2 by the air preheating system.
As shown in figure 1, the ash-containing flue gas with the temperature reduced to 250-700 ℃ is conveyed to a fine slag drying system 2 by an air preheating system, and the wet fine slag conveyed to the fine slag drying system from the fine slag conveying system 1 is dried. The water content of the fine slag is dried to 1% -7%, the temperature of the ash-containing flue gas is directly dried and then is reduced to 120-220 ℃, and then the flue gas enters a flue gas treatment system 6.
As shown in fig. 1, the flue gas treatment system 6 includes a dust remover, which can separate solid from gas of flue gas containing dust, and the solid part is fly ash, which is collected by the dust remover and can be sold as building material raw material; the flue gas after being dedusted is directly discharged to the atmosphere, so that the environmental pollution caused by the discharge of waste gas slag is reduced.
The utility model provides a direct heat exchange type gasification fine slag resource utilization system, which realizes independent combustion of gasification fine slag and cyclic utilization of waste heat energy generated by humidifying fine slag, drying and combustion, adopts a direct heat exchange type mode, namely ash-containing flue gas is taken as a heat exchange medium to carry out heat exchange in a direct contact heat exchange mode, and can carry out heat exchange for many times in the direct heat exchange system to achieve the purpose of efficiently utilizing heat energy, thereby improving the fine slag drying decarburization resource utilization rate and solving the industrial bottleneck problems of large difficulty in gasification fine slag treatment, serious environmental pollution and energy waste.
The utility model and its embodiments have been described above schematically, without limitation, and the utility model can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The representation in the drawings is only one of the embodiments of the utility model, the actual construction is not limited thereto, and any reference signs in the claims shall not limit the claims concerned. Therefore, if a person skilled in the art receives the teachings of the present invention, without inventive design, a similar structure and an embodiment to the above technical solution should be covered by the protection scope of the present patent. Furthermore, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Several of the elements recited in the product claims may also be implemented by one element in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (10)
1. A direct heat exchange type gasification fine slag resource utilization system is characterized by comprising a fine slag conveying system (1), a fine slag drying system (2), a dry slag storage unit (3), a fine slag combustion system (4), an air preheating system (5) and a flue gas treatment system (6);
the fine slag conveying system (1) is arranged at the foremost end of the system, and the output end of the fine slag conveying system (1) is connected with one input end of the fine slag drying system (2);
the fine slag drying system (2), the dry slag storage unit (3), the fine slag combustion system (4) and the air preheating system (5) are sequentially connected; the output end of the air preheating system (5) is connected with the other input end of the fine slag drying system (2);
the flue gas treatment system (6) is arranged at the tail end of the system, and the output end of the air preheating system (5) is connected with the input end of the flue gas treatment system (6).
2. The gasification fine slag resource utilization system according to claim 1, wherein a wet fine slag conveying channel is arranged between the fine slag conveying system (1) and the fine slag drying system (2).
3. The gasification fine slag resource utilization system according to claim 1, wherein a conveying channel for a mixture of dry fine slag and air is arranged between the fine slag drying system (2) and the dry slag storage unit (3).
4. The gasification fine slag resource utilization system according to claim 3, wherein the dry slag storage unit (3) comprises a quantitative feeding device, and the quantitative feeding device mixes the dry fine slag with hot air delivered by the air preheating system (5) and delivers the mixed dry fine slag and hot air to the fine slag combustion system (4) together as primary air of the fine slag combustion system (4).
5. The gasification fine slag resource utilization system according to claim 4, wherein a conveying channel for hot air and hot fine slag is arranged between the fine slag combustion system (4) and the dry slag storage unit, and the fine slag combustion system combusts the mixed hot air and hot fine slag conveyed by the dry slag storage unit (3) to obtain ash-containing flue gas and steam.
6. The gasification fine slag resource utilization system as claimed in claim 4, wherein the fine slag combustion system (4) is provided with a combustion furnace, an adiabatic combustion section and a steam generation section are arranged in the combustion furnace, and the adiabatic combustion section rapidly decarbonizes and combusts a mixture of dry fine slag and hot air; the steam generation section reacts the mixture of the hot fine slag and the hot air with water to obtain product steam, and simultaneously controls the temperature of ash-containing flue gas at the outlet of the fine slag combustion system (4).
7. The gasification fine slag resource utilization system according to claim 5, wherein an ash-containing flue gas conveying channel is arranged between the air preheating system (5) and the fine slag combustion system, the air preheating system preheats and mixes the ash-containing flue gas conveyed by the fine slag combustion system (4) with air, and hot air and the ash-containing flue gas are obtained after direct heat exchange.
8. The gasification fine slag resource utilization system according to claim 7, wherein a hot air conveying channel is arranged between the air preheating system (5) and the fine slag combustion system (4); a hot air conveying channel is arranged between the air preheating system (5) and the dry slag storage unit (3); an ash-containing flue gas conveying channel is arranged between the air preheating system (5) and the flue gas treatment system (6).
9. The gasification fine slag resource utilization system according to claim 1 or 3, wherein the flue gas treatment system (6) is provided with a discharge end for discharging ash-containing flue gas conveyed by the air preheating system (5) after dedusting.
10. The gasification fine slag resource utilization system according to claim 9, wherein a dust collector is arranged in the flue gas treatment system (6) and is used for carrying out solid-gas separation on the dust-containing flue gas output by the air preheating system (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122558887.4U CN216203469U (en) | 2021-10-22 | 2021-10-22 | Direct heat exchange type gasification fine slag resource utilization system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122558887.4U CN216203469U (en) | 2021-10-22 | 2021-10-22 | Direct heat exchange type gasification fine slag resource utilization system |
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| CN216203469U true CN216203469U (en) | 2022-04-05 |
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| CN202122558887.4U Active CN216203469U (en) | 2021-10-22 | 2021-10-22 | Direct heat exchange type gasification fine slag resource utilization system |
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